package com.sky.service.impl;

import com.sky.dto.GoodsSalesDTO;
import com.sky.entity.Orders;
import com.sky.mapper.OrderMapper;
import com.sky.mapper.UserMapper;
import com.sky.service.ReportService;
import com.sky.service.WorkspaceService;
import com.sky.vo.*;
import lombok.extern.slf4j.Slf4j;
import org.apache.commons.lang3.StringUtils;
import org.apache.poi.xssf.usermodel.XSSFRow;
import org.apache.poi.xssf.usermodel.XSSFSheet;
import org.apache.poi.xssf.usermodel.XSSFWorkbook;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.stereotype.Service;

import javax.servlet.ServletOutputStream;
import javax.servlet.http.HttpServletResponse;
import java.io.IOException;
import java.io.InputStream;
import java.time.LocalDate;
import java.time.LocalDateTime;
import java.time.LocalTime;
import java.util.ArrayList;
import java.util.HashMap;
import java.util.List;
import java.util.Map;
import java.util.stream.Collectors;

/**
 * @author ACE-Felix
 */
@Service
@Slf4j
public class ReportServiceImpl implements ReportService {
    @Autowired
    private OrderMapper orderMapper;
    @Autowired
    private UserMapper userMapper;
    @Autowired
    private WorkspaceService workspaceService;

    /**
     * 根据时间区间统计营业额
     * @param begin
     * @param end
     * @return
     */
    @Override
    public TurnoverReportVO getTurnover(LocalDate begin, LocalDate end) {
        List<LocalDate> dateList = new ArrayList<>();
        dateList.add(begin);

        while (!begin.equals(end)){
            // 日期计算，获得指定日期后的一天
            // begin = begin + 1
            begin = begin.plusDays(1);
            dateList.add(begin);
        }

        List<Double> turnoverList = new ArrayList<>();
        for (LocalDate date : dateList){
            LocalDateTime beginTime = LocalDateTime.of(date, LocalTime.MIN);
            LocalDateTime endTime = LocalDateTime.of(date, LocalTime.MAX);
            // 查询营业额
            Map map = new HashMap<>();
            map.put("status", Orders.COMPLETED);
            map.put("begin", beginTime);
            map.put("end", endTime);
            Double turnover = orderMapper.sumByMap(map);
            turnover = turnover == null ? 0.0 : turnover;
            turnoverList.add(turnover);

        }
        // 封装数据
        return TurnoverReportVO.builder()
                .dateList(StringUtils.join(dateList, ","))
                .turnoverList(StringUtils.join(turnoverList, ","))
                .build();
    }

    /**
     * 统计用户数据
     * @param begin
     * @param end
     * @return
     */
    @Override
    public UserReportVO getUser(LocalDate begin, LocalDate end) {
        // 获得时间区间内的所有日期
        List<LocalDate> dateList = new ArrayList<>();
        dateList.add(begin);
        while (!begin.equals(end)){
            // 日期计算，获得指定日期后一天的日期
            begin = begin.plusDays(1);
            dateList.add(begin);
        }
        // 获得每天新增用户数据 select count(id) from user where create_time between ? and ?
        List<Integer> newUserList = new ArrayList<>();
        // 获得每天总用户数据 select count(id) from user where create_time <  ?
        List<Integer> totalUserList = new ArrayList<>();
        for (LocalDate date : dateList){
            LocalDateTime beginTime = LocalDateTime.of(date, LocalTime.MIN);
            LocalDateTime endTime = LocalDateTime.of(date, LocalTime.MAX);
            Integer newUser = countUser(beginTime, endTime);
            newUserList.add(newUser);
            Integer totalUser = countUser(null, null);
            totalUserList.add(totalUser);
        }
        return UserReportVO.builder()
                .dateList(StringUtils.join(dateList, ","))
                .newUserList(StringUtils.join(newUserList, ","))
                .totalUserList(StringUtils.join(totalUserList, ","))
                .build();
    }

    /**
     * 根据时间区间统计用户数据
     * @param beginTime
     * @param endTime
     * @return
     */
    private Integer countUser(LocalDateTime beginTime, LocalDateTime endTime){
        Map map = new HashMap<>();
        map.put("begin", beginTime);
        map.put("end", endTime);
        return userMapper.countByMap(map);
    }

    /**
     * 统计订单数据
     * @param begin
     * @param end
     * @return
     */
    @Override
    public OrderReportVO getOrders(LocalDate begin, LocalDate end) {
        List<LocalDate> dateList = new ArrayList<>();
        dateList.add(begin);
        while (!begin.equals(end)){
            // 日期计算，获得指定日期后一天的日期
            begin = begin.plusDays(1);
            dateList.add(begin);
        }
        // 获得每天订单数据 select count(id) from orders where order_time between ? and ?
        List<Integer> orderCountList = new ArrayList<>();
        // 获得每天有效订单数据 select count(id) from orders where order_time between ? and ? and status = 5
        List<Integer> validOrderCountList = new ArrayList<>();
        for (LocalDate date : dateList){
            LocalDateTime beginTime = LocalDateTime.of(date, LocalTime.MIN);
            LocalDateTime endTime = LocalDateTime.of(date, LocalTime.MAX);
            Integer orderCount = countOrder(beginTime, endTime, null);
            orderCountList.add(orderCount);
            Integer validOrderCount = countOrder(beginTime, endTime, Orders.COMPLETED);
            validOrderCountList.add(validOrderCount);
        }
        //时间区间内的总订单
        Integer totalOrderCount = orderCountList.stream().reduce(Integer::sum).get();
        //时间区间内的总有效订单
        Integer validOrderCount = validOrderCountList.stream().reduce(Integer::sum).get();

        // 订单完成率
        Double orderCompletionRate = 0.0;
        if (totalOrderCount != 0){
            orderCompletionRate = validOrderCount.doubleValue() / totalOrderCount;
        }
        return OrderReportVO.builder()
                .dateList(StringUtils.join(dateList, ","))
                .orderCountList(StringUtils.join(orderCountList, ","))
                .validOrderCountList(StringUtils.join(validOrderCountList, ","))
                .totalOrderCount(totalOrderCount)
                .validOrderCount(validOrderCount)
                .orderCompletionRate(orderCompletionRate)
                .build();
    }

    /**
     * 根据时间区间统计订单数据
     * @param beginTime
     * @param endTime
     */
    private Integer countOrder(LocalDateTime beginTime, LocalDateTime endTime, Integer status){
        Map map = new HashMap<>();
        map.put("begin", beginTime);
        map.put("end", endTime);
        map.put("status", status);
        return orderMapper.countByMap(map);
    }


    /**
     * 统计销量排名top10
     * @param begin
     * @param end
     * @return
     */
    @Override
    public SalesTop10ReportVO getTop10(LocalDate begin, LocalDate end) {
        LocalDateTime beginTime = LocalDateTime.of(begin, LocalTime.MIN);
        LocalDateTime endTime = LocalDateTime.of(end, LocalTime.MAX);
        List<GoodsSalesDTO> salesTop10 = orderMapper.getSalesTop10(beginTime, endTime);

        return SalesTop10ReportVO.builder()
                .nameList(StringUtils.join(salesTop10.stream().map(GoodsSalesDTO::getName).collect(Collectors.toList()), ","))
                .numberList(StringUtils.join(salesTop10.stream().map(GoodsSalesDTO::getNumber).collect(Collectors.toList()), ","))
                .build();
    }

    /**
     * 导出运营数据报表
     * @param response
     */
    @Override
    public void exportBusinessData(HttpServletResponse response) {
        // 1.查询数据库，获取运营数据——获取近30天的数据
        LocalDate begin = LocalDate.now().minusDays(30);
        LocalDate end = LocalDate.now().minusDays(1);
        // 查询概览数据,提供给Excel模板文件
        BusinessDataVO businessData = workspaceService
                .getBusinessData(LocalDateTime.of(begin, LocalTime.MIN), LocalDateTime.of(end, LocalTime.MAX));

        // 2.通过POI将数据写入Excel文件中
        InputStream inputStream = this.getClass().getClassLoader().getResourceAsStream("template/运营数据报表模板.xlsx");
        // 基于模板文件创建一个新的Excel文件
        try {
            XSSFWorkbook excel =  new XSSFWorkbook(inputStream);
            // 获得Excel文件中的一个Sheet页
            XSSFSheet sheet = excel.getSheet("Sheet1");
            sheet.getRow(1).getCell(1).setCellValue(begin + "至" + end);
            // 获得第4行
            XSSFRow row = sheet.getRow(3);
            // 获取单元
            row.getCell(2).setCellValue(businessData.getTurnover());
            row.getCell(4).setCellValue(businessData.getOrderCompletionRate());
            row.getCell(6).setCellValue(businessData.getNewUsers());
            row = sheet.getRow(4);
            row.getCell(2).setCellValue(businessData.getValidOrderCount());
            row.getCell(4).setCellValue(businessData.getUnitPrice());
            for (int i = 0; i < 30; i++) {
                LocalDate date = begin.plusDays(i);
                //准备明细数据
                businessData = workspaceService.getBusinessData(LocalDateTime.of(begin,LocalTime.MIN), LocalDateTime.of(end, LocalTime.MAX));
                row = sheet.getRow(7 + i);
                row.getCell(1).setCellValue(date.toString());
                row.getCell(2).setCellValue(businessData.getTurnover());
                row.getCell(3).setCellValue(businessData.getValidOrderCount());
                row.getCell(4).setCellValue(businessData.getOrderCompletionRate());
                row.getCell(5).setCellValue(businessData.getUnitPrice());
                row.getCell(6).setCellValue(businessData.getNewUsers());

                //通过输出流将文件下载到客户端浏览器中
                ServletOutputStream out = response.getOutputStream();
                excel.write(out);
                //关闭资源
                out.flush();
                out.close();
                excel.close();
            }

        } catch (IOException e) {
            throw new RuntimeException(e);
        }
    }
}
